October 19

Any differences between the group means increases

  • The MSBetween increases

  • The F score decreases

  • The MSwithin decreases

  • The df Between Increases

ANSWER: The MSBetween increases

F-scores are likely to be significant if differences between treatment means is and treatment variances are

  • large; large

  • large; small

  • small;large

  • small; small

If the within group variance estimate is bout the same as the between group variance estimate them: differences between means is due to random sampling error

In SPSS, how many columns of data are needed for independent variables when conducting a between subjects analysis?

  • 1 for each independent variable

  • 1 for each level of independent variable

  • 1 for each subject

  • It depends on how many levels are in the independent variable

Which of these are true?

  • variance is known as error variance

  • Variance between is known as error variance

  • Variance within is known as systematic variance

  • Variance between is known as systemic variance

Dependent variables need to be set to “nominal” in order to conduct a vetween subjects analysis in SPSS True of False?: FALSE

Module 8 Lab

No Aids

Study Guide

Study Guide + Practice Test

80

88

78

90

85

86

86

80

75

Considerations:

  • The F-value says whether, or not, something “happened

  • The means tell you what exactly happened

  • Post hocs tell you which mean differences are significant

Which group did best on the exam?

  • the study guide group

Was the difference significant?: Yes the difference was significant

APA Review

F(dfbetween, dfwithin)= , _, sig

  • F is capital and in italics

  • No space between the F and (

  • Space after , but nobefore

  • Spaces around oeprators (= and <)

  • F(2,6) = 6.32, p < .05

  • A teacher wanted to know if access to study materials impacted exam performance. Nine students were randomly assigned to either receive no study aids, a study guide, or both a study guide and practice exam. The instructor recorded the exam grade as a percentage. A one-way between subjects ANOVA was conducted on their grades. Results showed a significant difference in exam performance (F(2,6) - 6.32, p <.05)

  • Which differences are significant?

    A. No aids; Study guide

    B. No aids; Study guide plus practice test

    C. Study guide; Study guide plus practice test

Reporting Post hocs

  • LSD posthoc tests results did not show a significant difference in exam score for those given no study aids (M = 85.00, SD = 5.00) and those given a study guide only( M = 86.67, SD = 1.15; n.s) (Nothing and study guide comparison.) (Nothing and everything comparison.) However, those who were given both a study guide and practice exam did significantly worse ( M = 77.67, SD = 2.52) than those who had just a study guide (p < .05) or had no study materials provided. (p <.05) (Study guide and everything comparison)

Complete APA paragraph (ignore the parentheses comments)

A teacher wanted to know if access to study materials impacted exam performance. Nine students were randomly assigned to either receive no study aids, a study guide, or both a study guide and practice exam. The instructor recorded the exam grade as a percentage. A one-way between subjects ANOVA was conducted on their grades. Results showed a significant difference in exam performance (F(2,6) - 6.32, p <.05)

LSD posthoc tests results did not show a significant difference in exam score for those given no study aids (M = 85.00, SD = 5.00) and those given a study guide only( M = 86.67, SD = 1.15; n.s) (Nothing and study guide comparison.) (Nothing and everything comparison.) However, those who were given both a study guide and practice exam did significantly worse ( M = 77.67, SD = 2.52) than those who had just a study guide (p < .05) or had no study materials provided. (p <.05) (Study guide and everything comparison)

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